. The development of the human body : a manual of human embryology. Embryology; Embryo, Non-Mammalian. THE INTERNAL EAR 435 anterior wall of the otocyst. The origin of the ganglionic mass has not yet been traced in the mammalia, but it has been observed that in cow embryos the geniculate ganglion is connected with the ecto- derm at the dorsal end of the first branchial cleft (Froriep), and it may perhaps be regarded as one of the epibranchial placodes (see p. 417), and in the lower vertebrates a union of the ganglion with a suprabranchial placode has been observed (Kupffer), this union. Fig. 2
. The development of the human body : a manual of human embryology. Embryology; Embryo, Non-Mammalian. THE INTERNAL EAR 435 anterior wall of the otocyst. The origin of the ganglionic mass has not yet been traced in the mammalia, but it has been observed that in cow embryos the geniculate ganglion is connected with the ecto- derm at the dorsal end of the first branchial cleft (Froriep), and it may perhaps be regarded as one of the epibranchial placodes (see p. 417), and in the lower vertebrates a union of the ganglion with a suprabranchial placode has been observed (Kupffer), this union. Fig. 257.—Reconstruction of the Otocyst of an Embryo of 20 mm., front view. cc, Common limb of superior and posterior semicircular ducts; eg, cochlear ganglion; co, cochlea; de, endolymphatic duct; s, sacculus; sdl, sdp, and sdsx lateral, posterior and superior semicircular ducts; u, utriculus; vg, vestibular ganglion.—{Streeter.) indicating the origin of the auditory ganglion from one or more of the ganglia of the lateral line system. At an early stage in the human embryo the auditory ganglion shows indications of a division into two portions, a more dorsal one, which represents the future ganglion vestibular e, and a ventral one, the ganglion cochleare. The ganglion cells become bipolar, in which condition they remain throughout life, never reaching the T-shaped condition found in most of the other peripheral cerebro-spinal gang- lia. One of the prolongations of each cell is directed centrally to. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original McMurrich, J. Playfair (James Playfair), 1859-1939. Philadelphia : P. Blakiston's son & co.
Size: 1391px × 1797px
Photo credit: © Central Historic Books / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookautho, bookcentury1900, bookdecade1910, booksubjectembryology
